Why is governing of hydraulic turbine needed?
GOVERNING OF HYDRAULIC TURBINES Governing of hydraulic turbine means speed regulation. Governing of a turbine is necessary as a turbine is directly coupled to an electric generator, which is required to run at constant speed under all fluctuating load conditions.
What is the need of governing a turbine?
Steam turbine governing is the procedure of controlling the flow rate of steam to a steam turbine so as to maintain its speed of rotation as constant. The variation in load during the operation of a steam turbine can have a significant impact on its performance.
What is meant by governing of hydraulic turbines?
“The governing of a turbine is defined as the operation by which the speed of the turbine is kept constant under all working conditions (irrespective of the load variations).”
What do you mean by governing of reaction turbine?
The process by which the speed of rotation of turbine rotor is kept constant will be termed as governing of a turbine and it is well discussed in our previous post.
What is the specific speed of turbine?
The specific speed value for a turbine is the speed of a geometrically similar turbine which would produce unit power (one kilowatt) under unit head (one meter). The specific speed of a turbine is given by the manufacturer (along with other ratings) and will always refer to the point of maximum efficiency.
What is flow ratio in turbine?
The flow ratio of Francis turbine is defined as the ratio of the velocity of flow at the inlet to the theoretical jet velocity.
What is hydraulic efficiency of a turbine?
Explanation: Hydraulic efficiency is defined as ratio between power given by water to runner of turbine and to the power supplied by water at inlet of the turbine. This efficiency will be maximum when differentiating it with “u” and it is obtained as u=v/2.
How efficient is a turbine?
In actuality, turbines are typically 80 to 90 percent efficient, but this factor does not need to be included here to show the importance of condenser performance. Conditions are: Main Steam (Turbine Inlet) Pressure – 1,000 psia. Main Steam Temperature – 1,000 F.
Which is not a reaction turbine?
Pelton wheel is not a reaction turbine whereas Thomson’s turbine, Journal turbine and Fourneyron turbine are reaction turbine.
Which turbine is best?
Turbines
- Francis turbine. The most commonly used turbine in Hydro-Québec’s power system.
- Kaplan turbine. Austrian engineer Viktor Kaplan (1876-1934) invented this turbine.
- Propeller turbine. Since they can reach very high rotation speeds, propeller turbines are effective for low heads.
- Pelton turbine.